Oxidized bitumen 115/15 is using in roofing manufacturing plants to produce shingles, roll goods, built-up roofing felts, and under layment felts, these oxidized asphalt 115/15 are shipped cold in bag and heating to became hot until used in the manufacturing process . 

Most blown bitumen 115/15 used to produce “mopping-grade” roofing asphalts. 

These bitumen 115/15 are generally shipped as a solid and heated in a kettle at the work site. 

Blown bitumen grades or Oxidized Bitumen are produced by passing air through the penetration grades. 

This process gives the bitumen more rubbery properties than its original formula and they are simply harder bitumen.